We are just going through something similar, my bitch is in heat and my boy ( chained up to his kennel) wouldn't stop barking at all times of the night and day so we tok her over to my Mum's yesterday and i had the best night's sleep ever last night!!
But back to the jumping, have you heard of clicker training? it works on rewarding the good behavour. You start off by spending time with them and getting them used to a clicker. You click and then reward with a treat ( Something soft like luncheon sausage) once they know they will get a treat from just hearing the clicker then you can train them to do anything!!!!
So in your case take him up to the fence and click and reward him so that he knows just being at the bottom of the fence on the right side he will get a reward for it.
With my dog the second he stops barking he gets a treat so associates not barking with getting a treat!!
HTH and the best of luck